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SONY PCS-AC15
Manual de Servicio


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  • Contiene diagramas del circuito
  • Descargable
  • Formato PDF
  • Manual completo
  • Idiomas: English
Precio: $4.99

Descripción del SONY PCS-AC15 Manual de Servicio

Manual de servicio completo en formato digital (archivo PDF). Los manuales de servicio por lo general contienen diagramas de circuitos, tarjetas de circuitos impresos, consejos para reparación, diagramas de cableado, diagramas de bloque y lista de refacciones. El Manual de Servicio (a veces llamado Manual de Reparación) es usado principalmente por los técnicos.

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The manual is available in languages: English

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TEXT_PDF_SNIPPET
4-1. Check Items Before Starting Self-diagnostics

3. When the DE-55 board is suspected to be defective . Select an oscilloscope setup of 20 MHz with band-width limit: OFF. . Adjust the brightness of the incoming light until 400 mVp-p is obtained at TP401 and TP402. . The circuit stage up to TP141 must be diagnosed by observing the waveform of the carrier signal and by checking the operating condition with no input signal fed to the infrared transmitter. The circuit stages after that must be diagnosed by observing the demodulated waveform and by checking the operating condition with the color bar signal being input to the infrared transmitter. a) Check that the DC voltages that are supplied from the power supply to the respective blocks are correct or not. � When the DC voltages are normal, the voltages from MA-107/107P board are; TP491: 5 ± 0.5 V, TP391: 9 ± 0.5 V. � When DC voltages are abnormal; Soldering of CN101 is suspected to be defective, or flexible flat cable (FFC) has poor connection or is broken. b) Check DC voltage at L491 and check the signal flow from TP401 to TP404. [RF amplifier] � When the circuit is normal, the waveforms [No. 1 to No. 5] that are shown on page 4-21 can be obtained with no input signal fed to the infrared transmitter. � When the circuit is found abnormal; Resoldering the poorly soldered joint in the circuit block of Ref. 400 to Ref. 409. Replace the transistor as needed. c) Check DC voltage at L492 and check the signal flow from TP421 to TP424. [RF amplifier] � When the circuit is normal, the waveforms [No. 1 to No. 5] that are shown on page 4-21 can be obtained with no input signal fed to the infrared transmitter. � When the circuit is found abnormal; in the circuit block of Ref. 420 to Ref. 439. Replace the transistor as needed. d) Check DC voltage at L491. [ANALOG_5.9 V] � When the circuit is normal; 5.9 ± 0.5 V � When the circuit is found abnormal; Resoldering the poorly soldered joint in the circuit block in which abnormality has occurred. Replace the transistor Q901 or others as needed. e) Check Q110 for correct operation by observing the output waveform at TP101. [BUFFER] � When the circuit is normal, the waveform [No. 6] that is shown on page 4-21 can be obtained with no input signal fed to the infrared transmitter. � When the circuit is found abnormal; Resoldering the poorly soldered joint in the circuit block in which abnormality has occurred. Replace the transistor Q110 or others as needed. f) Check IC101 for correct operation by observing the output waveform at TP102. [LIMITTER] � When the circuit is normal, the waveform [No. 7] that is shown on page 4-22 can be obtained with no input signal fed to the infrared transmitter. � When the circuit is found abnormal; Resoldering the poorly soldered joint in the circuit block in which abnormality has occurred. Replace IC101 or others as needed.

4-18

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